摘要:
Method for producing extruded structural profiles from aluminum or aluminum alloy scrap materials. The scrap materials are compacted under room temperature or under heat suitable for hot extrusion into a cylindrical body which is of such a dimension that is suitable for insertion into an extruder. The compacted body has an average density which is 70 to 86 percent of that of aluminum, and includes longitudinal air passages. Suction pressure is applied to the interior of the extruder during extruding process for removing air entrapped in the body, which may otherwise cause voids in the extruded products.
摘要:
Aluminum or aluminum alloy scraps or wastes are broken into chips and extruded under a high temperature to produce extruded structural profiles. The method is characterized by the fact that the interior of the extruder is evacuated prior to or simultaneously with the extrusion step so as to exhaust air entrapped in the body of the chips. There is also disclosed apparatus suitable for performing the method.
摘要:
Aluminum or aluminum alloy scraps or wastes are broken into chips and converted into a cylindrical body to be extruded under a temperature suitable to produce extruded structural profiles. The method is characterized by the fact that the interior of the extruder is evacuated prior to or simultaneously with the extrusion step so as to exhaust air entrapped in the cylindrical body.
摘要:
Aluminum or aluminum alloy scraps or wastes are broken into chips and extruded under a high temperature to produce extruded structural profiles. The method is characterized by the fact that the interior of the extruder is evacuated prior to or simultaneously with the extrusion step so as to exhaust air entrapped in the body of the chips. There is also disclosed apparatus suitable for performing the method.
摘要:
An aluminum alloy consising essentially of 0.65 to 0.75% by weight of magnesium and 0.50 to 0.60% by weight of silicon or 0.47 to 0.57% by weight of magnesium and 0.75 to 0.85% by weight of silicon, 0.15% to 0.25% by weight of iron, less than 0.05% of an impurity selected from the group consisting of copper, manganese, zinc, chromium, and titanium and the balance aluminum, the aluminum alloy being subjected to aging treatment at a temperature below 200.degree. C for 20 to 50 minutes to obtain 0.2% proof stress larger than 11 kg/mm.sup.2, ultimate tensile strength larger than 20 kg/mm.sup.2 and elongation more than 8%. Aluminum alloy shapes are formed of the above aluminum alloy by extrusion forming of the aluminum alloy to obtain an extrusion, coating a film on the surface of the extrusion with a water-soluble paint after forming thereon a ground film, heating the extrusion at a temperature below 200.degree. C for 20 to 50 minutes to effect printing and hardening of the coated film and age hardening of the extrusion at the same time.
摘要:
A strong base layer for painting on an aluminous material, a thermosetting resin paint and a painted film having high cohesion and corrosion resistance are produced by forming a boehmite layer in various processes on the aluminous material and immersing the aluminous material provided with the boehmite layer in a water soluble thermosetting resin paint at 40.degree.-60.degree.C containing an organic amine and removing the aluminous material from the paint bath and heating the paint thus deposited on the aluminous material to bake and cure the paint.
摘要:
A method of forming a colored oxide film on the surface of an aluminum material is disclosed in which the aluminum material is subjected to an electrolytic treatment in an aqueous solution containing sulfuric acid to form an aluminum oxide film containing aluminous oxides and having lattice defects; sulfuric ions in the solution are caused to enter into the lattice defects of the oxide film; some or all of the sulfuric ions are reduced to form sulfur and sulfides; and the colored oxide film is formed using the sulfur and sulfides as coloring sources.
摘要:
An apparatus for detecting a extending boundary between fields mowed and not mowed by an cutting blade mechanism of an autonomous vehicle for the mowing of lawn grass, comprises a plurality of rocking members provided to be aligned in a lateral direction of the vehicle under a body of the vehicle, a plurality of rocking condition sensors provided to detect rocking conditions of the respective rocking members, and a control unit provided to determine a boundary between a rocking member rocked by taller lawn grass and a rocking member not rocked as the boundary between the mowed field and not mowed field in response to signals from the rocking condition sensors. There is further provided a method for shifting the vehicle to a ready position of a next lane to be mowed in the work area based on the result of the detection by the boundary detecting apparatus.
摘要:
An internal combustion engine comprises a cylinder, a piston reciprocating in the cylinder, piston rings arranged on the periphery of the piston, and at least a pair of oil ports symmetrically provided in a wall member of the cylinder. The oil ports communicate with the space between the wall member and the piston and are positioned to open onto the portion below the lowermost piston ring during the reciprocation of the piston. A system supplies a portion of the lubricating oil for the internal combustion engine under pressure to this space through the oil ports, and conduits communicate the oil ports with the supply system.
摘要:
When an engine is operated at a low and medium speed range, since the combustion pressure introduced into a pressure chamber of a valve drive unit is relatively small, a control valve is projected toward the cylinder by the biasing force of a spring so as to lower the upper edge of the exhaust port. At the same time, in conjunction with this motion of the control valve, a resonance chamber is opened so as to communicate between the resonance chamber and the exhaust port, thereby the engine power is increased. When the engine is operated at a high speed range, since the combustion pressure is relatively large, the control valve goes away from the cylinder so as to enlarge the exhaust port and at the same time, in conjunction with this motion of the control valve, the resonance chamber is closed, thereby the engine power is increased.